US6909690B1 - Call admission control in telecommunication networks - Google Patents
Call admission control in telecommunication networks Download PDFInfo
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- US6909690B1 US6909690B1 US09/483,476 US48347600A US6909690B1 US 6909690 B1 US6909690 B1 US 6909690B1 US 48347600 A US48347600 A US 48347600A US 6909690 B1 US6909690 B1 US 6909690B1
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- 238000004891 communication Methods 0.000 claims abstract description 151
- 230000001629 suppression Effects 0.000 claims abstract description 91
- 230000000694 effects Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 16
- 238000012545 processing Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000006727 cell loss Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/822—Collecting or measuring resource availability data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/15—Flow control; Congestion control in relation to multipoint traffic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/76—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions
- H04L47/762—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions triggered by the network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/80—Actions related to the user profile or the type of traffic
- H04L47/801—Real time traffic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/83—Admission control; Resource allocation based on usage prediction
Definitions
- the invention relates to communication networks, and specifically, to a communication hub that controls access to a communication network based on silence suppression.
- Advanced communication networks are being developed to support a vast array of communication services.
- One example of an advanced communication network is a packet network.
- a communication hub located on a subscriber's premise and connected to one or multiple user devices exchanges communications with the network over a communication path.
- the communication path between the communication hub and the network typically includes a fixed bandwidth capacity agreed to between the customer and the service provider.
- a connection request is received in the communication hub from a user device.
- the communication hub suppresses, compresses, and packetizes the incoming digital signals from the user device for transmission to the network.
- the network determines whether or not to allow the connection request using call admission control.
- Call admission control is the set of actions taken by the network during the call setup phase to accept or reject the connection request. For example, if the effective bandwidth for the connection request is greater than the provisioned bandwidth capacity purchased by the customer, the network will reject the call using call admission control.
- the effective bandwidth is the minimum bandwidth that needs to be allocated to meet the performance requirements for the currently active calls and the incoming connection request. If the connection request can be processed without violating the provisioned bandwidth, then the call is admitted.
- a silence suppression gain factor is used to determine the required bandwidth for voice calls based on the silence suppression realized by filling the silence periods with other transmissions.
- the silence suppression gain factor is a constant based on a statistical calculation of the silence suppression realized for the large number of active voice calls present at any given time at the network level.
- the constant silence suppression gain factor is applied to incoming voice calls to determine the effective bandwidth for the currently active calls in conjunction with the incoming voice call.
- the present invention advances the art by providing a communication hub configured to perform call admission control over a communication path to the network based on silence suppression.
- the communication hub controls access in real-time to the communication network based on a silence suppression gain realized for an incoming call based on the silence suppression realized for the incoming call and a number of currently active calls.
- the access decision is based on a comparison of the provisioned bandwidth for the communication path and the effective bandwidth required to accommodate the incoming call and the currently active calls.
- the effective bandwidth required is based on a calculation of the silence suppression gain relative to the number of currently active calls.
- the communication hub is comprised of a silence suppression block, a call admission block, a control system, and an interface system.
- the silence suppression block is configured to compute the silence suppression gain for an incoming call based on the silence suppression realized for the incoming call and the number of currently active calls.
- the call admission. block is configured to control access to the communication network over the communication path based on the silence suppression gain for the incoming call.
- the control system is configured to determine the type of the incoming call and control the silence suppression block and the call admission block.
- the interface system is configured to receive the incoming call and exchange call traffic with the communication network over the communication path.
- a first advantage of the present invention is that the call admission control features are active when a new call session is requested and when a call session is released. Thus, the provisioned bandwidth for a communication path is protected from violating the desired quality of service.
- a second advantage of the present invention is that the computation of the silence suppression gain for individual calls relative to the number of currently active calls increases utilization efficiency for the communication path.
- a third advantage of the present invention is that congestion is reduced without resorting to packet dropping or cell dropping at the network level.
- FIG. 1 illustrates a communication hub according to the present invention
- FIG. 2 is a flow chart illustrating the operational steps of a communication hub according to the present invention.
- FIG. 3 illustrates a network architecture according to the present invention.
- FIGS. 1 - 2 The Communication Hub FIGS. 1 - 2 :
- FIG. 1 depicts a communication hub 100 , a communication network 101 , and communication paths 103 , 104 , 105 , and 109 .
- the communication hub 100 is comprised of a control system 102 and an interface system 108 .
- the control system 102 is comprised of a silence suppression block 106 and a call admission block 107 .
- the interface system 108 is connected to the communication network 101 by communication path 109 .
- the communication path 109 could be any wireless or wireline communication path capable of interfacing with the communication network 101 .
- the interface system 108 is also connected to the control system 102 and the communication paths 103 , 104 , and 105 .
- the communication paths 103 , 104 , and 105 could be conventional wireline or wireless communication paths.
- the interface system 108 could handle numerous other such communication paths, although only communication paths 103 , 104 , 105 , and 109 are shown for clarity.
- the communication hub 100 could include other conventional components not shown on FIG. 1 for clarity.
- the communication hub 100 could include other conventional elements such as voice compression elements to accommodate different coding rates.
- the communication network 101 could be any communication network configured to provide audio, video, or data services. Some examples of the communication network 101 include without limitation, a packet network, an internet, and an ethernet.
- the silence suppression block 106 could be any logic block configured to compute a silence suppression gain for an incoming call based on a silence suppression realized for the incoming call and a number of currently active calls.
- the call admission block 107 could be any logic block configured to control access to the communication network 101 over the communication path 109 based on the silence suppression gain for the incoming call.
- the control system 102 could be any device or plurality of devices configured to determine the call type of the incoming call and control the silence suppression block 106 and the call admission block 107 .
- the interface system 108 could be any device or plurality of devices configured to receive the incoming call over one of the communication paths 103 , 104 , and 105 and exchange call traffic with the communication network 101 over the communication path 109 .
- the interface system 108 could be a conventional voice interface that acts as a POTS interface, supervises signals, channels voice lines, resolves contention between voice lines, or samples, digitizes and compresses analog signals into packets.
- FIG. 2 depicts a flow diagram of the operational steps of the communication hub 100 .
- an incoming call request is received in the interface system 108 over one of the communication paths 103 , 104 , and 105 at step 200 .
- the interface system 108 provides the incoming call request to the control system 102 .
- the control system 102 determines the call type for the incoming call request. If the call type is a voice call at step 202 , processing continues at step 203 and the control system 102 uses the silence suppression block 106 to compute the silence suppression gain based on the silence suppression realized for the incoming call and the number of currently active voice calls.
- the control system 102 uses the call admission block 107 to compute the effective bandwidth required to accommodate the number of currently active calls and the incoming call based on the silence suppression gain. If the effective bandwidth required is less than or equal to the provisioned bandwidth of the communication path 109 at step 205 , processing continues at step 206 and the call admission block 107 grants access to the communication network 101 and the call is completed over communication path 109 . If the effective bandwidth required is greater than the provisioned bandwidth of the communication path 109 at step 206 , processing continues at step 207 and the call admission block 107 denies access to the communication network 101 and the call is rejected.
- processing continues at step 204 and the control system 102 uses the call admission block to compute the effective bandwidth required to accommodate the number of currently active calls and the incoming call. If the effective bandwidth required is less than or equal to the provisioned bandwidth of the communication path 109 at step 205 , processing continues at step 206 and the call admission block 107 grants access to the communication network 101 and the call is completed over communication path 109 . If the effective bandwidth required is greater than the provisioned bandwidth of the communication path 109 at step 205 , processing continues at step 207 and the call admission block 107 denies access to the communication network 101 and the call is rejected. It should be noted that if access to the communication network 101 is granted at step 206 , the call is a currently active call and is concurrently active with other currently active calls.
- FIG. 3
- FIG. 3 depicts a network architecture in an example according to the present invention.
- Those skilled in the art will appreciate numerous variations that do not depart from the present invention.
- Those skilled in the art will also appreciate that various features described-below could be combined with the above described embodiment to form multiple variations of the invention.
- FIG. 3 depicts the communication network 101 , a network gateway 317 , communication hubs 307 and 308 , and user devices 301 , 302 , 303 , 304 , 305 , and 306 .
- the communication hub 307 is connected to the network gateway 317 by communication paths 309 , 310 , 311 , and 312 .
- the communication hub 307 is also connected to the user devices 301 , 302 , and 303 by conventional voice lines.
- the communication hub 308 is connected to the network gateway 317 by communications paths 313 , 314 , 315 , and 316 .
- the communication hub 308 is also connected to the user devices 304 , 305 , and 306 by conventional voice lines.
- the network gateway 317 is connected to the communication network 101 by communication path 318 .
- the communication paths 309 - 316 could be conventional packet connections. Some examples of the communication paths 309 - 316 include without limitation, voice over internet protocol over asynchronous transfer mode (ATM) and ATM adaptation layer type 2 (AAL 2 ) paths.
- the communication path 318 could be a conventional network trunk that provides network access and connectivity.
- the user devices 301 , 302 , 303 , 304 , 305 , and 306 could be conventional communication devices that use the analog or digital telephony format. Some examples of user devices 301 , 302 , 303 , 304 , 305 , and 306 include without limitation, telephones, modems, facsimile machines, computer systems, and video conferencing equipment.
- the communication hub 307 could be any device or group of devices configured to receive incoming calls from user devices 301 , 302 , and 303 , and control access to each of the communication paths 309 - 312 based on silence suppression.
- the communication hub 308 could be any device or group of devices configured to receive incoming calls from user devices 304 , 305 , and 306 and control access to each of the communication paths 313 - 316 based on silence suppression.
- the network gateway 317 could be a conventional network gateway that provides access to the communication network 101 .
- the network gateway 317 could also be a conventional multiplexer that exchanges communications between communication network 101 and communication hubs 307 and 308 .
- the network gateway 317 could also be configured with the features of the communication hubs 307 and 308 to control access to communication path 318 based on silence suppression.
- the call admission decision for an incoming call is based on the provisioned bandwidth for a given communication path, e.g. 309 , and the effective bandwidth required to accommodate the incoming call and the number of currently active calls over that communication path.
- the effective bandwidth required is determined by the silence suppression gain realized as a function of the number of superposed voice calls.
- the silence suppression gain is a discrete non-linear function calculated on a per call basis as a function of the silence suppression gain realized for the incoming voice call with respect to the number of currently active voice calls.
- ⁇ ⁇ 1 the mean talkspurt duration for a single voice source in milliseconds (ms);
- ⁇ ⁇ 1 the mean silence duration for a single voice source in ms
- T the packetization time in ms
- n the number of superposed voice sources
- A activity factor
- Table 1 illustrates the silence suppression gain factor ( ⁇ ) for a given number of voice calls (n).
- Table 2 illustrates the effective bandwidth required for a given number of voice calls (n) and a given number of voice band data calls (m) in the lower bound.
- RTCP real time conferencing protocol
- RTP control protocol real time conferencing protocol
- the admission decision is based on the total effective bandwidth required (B) for an incoming call and the number of concurrently active voice and voice-band data calls relative to the provisioned bandwidth (B′) of the communication path 309 . For example, if a customer service agreement allocates a provisioned bandwidth (B′) for communication path 309 , the admission decision is based on a comparison of (B) to (B′). If (B) is less than or equal to the provisioned bandwidth (B′) the call should be admitted. If (B) is greater than or equal to the provisioned bandwidth (B′) the call should be denied.
- CLR Timer_CU and cell loss ratio
- the above-described communication hub can include instructions that are stored on storage media.
- the instructions can be retrieved and executed by a processor.
- Some examples of instructions are software, program code, and firmware.
- Some examples of storage media are memory devices, tape, disks, integrated circuits, and servers.
- the instructions are operational when executed by the processor to direct the processor to operate in accord with the invention.
- the term “processor” refers to a single processing device or a group of inter-operational processing devices. Some examples of processors are integrated circuits and logic circuitry. Those skilled in the art are familiar with instructions, processors, and storage media.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
Abstract
Description
where:
and where:
n | ρn | ||
1 | 0.943 | ||
2 | 0.829 | ||
3 | 0.702 | ||
4 | 0.596 | ||
5 | 0.523 | ||
6 | 0.478 | ||
7 | 0.452 | ||
8 | 0.437 | ||
9 | 0.427 | ||
10 | 0.421 | ||
11 | 0.418 | ||
12 | 0.415 | ||
13 | 0.413 | ||
14 | 0.411 | ||
15 | 0.410 | ||
16 | 0.409 | ||
17 | 0.408 | ||
18 | 0.408 | ||
19 | 0.407 | ||
20 | 0.407 | ||
21 | 0.406 | ||
22 | 0.406 | ||
23 | 0.405 | ||
24 | 0.405 | ||
n/m | B1n | B2m |
1 | 119.89 | 127.2 |
2 | 210.89 | 254.4 |
3 | 267.71 | 381.6 |
4 | 303.00 | 508.8 |
5 | 332.56 | 636.0 |
6 | 365.02 | 763.2 |
7 | 402.48 | 890.4 |
8 | 444.25 | 1017.6 |
9 | 489.11 | 1144.8 |
10 | 536.01 | 1272.0 |
11 | 584.22 | 1399.2 |
12 | 633.24 | 1526.4 |
13 | 682.76 | 1653.6 |
14 | 732.6 | 1780.8 |
15 | 782.65 | 1980.0 |
16 | 832.84 | 2035.2 |
17 | 883.12 | 2162.4 |
18 | 933.47 | 2289.6 |
19 | 983.87 | 2416.8 |
20 | 1034.32 | 2544.0 |
21 | 1084.8 | 2671.2 |
22 | 1135.31 | 2798.4 |
23 | 1185.85 | 2925.6 |
24 | 1236.4 | 3052.8 |
Claims (42)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US09/483,476 US6909690B1 (en) | 2000-01-14 | 2000-01-14 | Call admission control in telecommunication networks |
CA002330881A CA2330881A1 (en) | 2000-01-14 | 2001-01-11 | Call admission control in telecommunication networks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US09/483,476 US6909690B1 (en) | 2000-01-14 | 2000-01-14 | Call admission control in telecommunication networks |
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US6909690B1 true US6909690B1 (en) | 2005-06-21 |
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US09/483,476 Expired - Lifetime US6909690B1 (en) | 2000-01-14 | 2000-01-14 | Call admission control in telecommunication networks |
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CA (1) | CA2330881A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020110090A1 (en) * | 2001-01-16 | 2002-08-15 | Ntt Docomo, Inc. | Call acceptance control method, mobile communication system and base station device |
US20040002864A1 (en) * | 2002-06-28 | 2004-01-01 | Eung-Moon Yeom | Method for controlling bandwidth in a voice over internet protocol system |
US20040151166A1 (en) * | 2003-02-05 | 2004-08-05 | Tsutomu Tsukagoshi | Packet communication system, network device and method of managing resource employed therefor |
US20060223586A1 (en) * | 2005-03-30 | 2006-10-05 | Nec Corporation | Transport resource control system and method, and radio network controller used in the same |
US7512068B1 (en) * | 2004-07-02 | 2009-03-31 | Nortel Networks Limited | Call admission control for a wireless network |
ES2336998A1 (en) * | 2008-10-16 | 2010-04-19 | Vodafone España, S.A.U. | Method for assigning bandwidth in the call admission control of lub interface |
US20100150023A1 (en) * | 2007-02-02 | 2010-06-17 | Andreas Witzel | Method and node for the control of a connection in a communication network |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6631269B1 (en) | 2002-05-23 | 2003-10-07 | Interdigital Technology Corporation | Signaling connection admission control in a wireless network |
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-
2000
- 2000-01-14 US US09/483,476 patent/US6909690B1/en not_active Expired - Lifetime
-
2001
- 2001-01-11 CA CA002330881A patent/CA2330881A1/en not_active Abandoned
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020110090A1 (en) * | 2001-01-16 | 2002-08-15 | Ntt Docomo, Inc. | Call acceptance control method, mobile communication system and base station device |
US7492784B2 (en) * | 2001-01-16 | 2009-02-17 | Ntt Docomo, Inc. | Call acceptance control method, mobile communication system and base station device |
US20040002864A1 (en) * | 2002-06-28 | 2004-01-01 | Eung-Moon Yeom | Method for controlling bandwidth in a voice over internet protocol system |
US7236483B2 (en) * | 2002-06-28 | 2007-06-26 | Samsung Electronics Co., Ltd. | Method for controlling bandwidth in a voice over internet protocol system |
US20040151166A1 (en) * | 2003-02-05 | 2004-08-05 | Tsutomu Tsukagoshi | Packet communication system, network device and method of managing resource employed therefor |
US7512068B1 (en) * | 2004-07-02 | 2009-03-31 | Nortel Networks Limited | Call admission control for a wireless network |
US20060223586A1 (en) * | 2005-03-30 | 2006-10-05 | Nec Corporation | Transport resource control system and method, and radio network controller used in the same |
US20100150023A1 (en) * | 2007-02-02 | 2010-06-17 | Andreas Witzel | Method and node for the control of a connection in a communication network |
US8634326B2 (en) * | 2007-02-02 | 2014-01-21 | Telefonaktiebolaget L M Ericsson (Publ) | Method and node for the control of a connection in a communication network |
ES2336998A1 (en) * | 2008-10-16 | 2010-04-19 | Vodafone España, S.A.U. | Method for assigning bandwidth in the call admission control of lub interface |
EP2178326A1 (en) | 2008-10-16 | 2010-04-21 | Vodafone Group PLC | Method for assigning bandwidth in the call admission control of lub interface |
EP2178326B1 (en) * | 2008-10-16 | 2012-12-26 | Vodafone Group PLC | Method for assigning bandwidth in the call admission control of lub interface |
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